#include"string.h"

namespace cls
{
	void Test()
	{
		string s1("caolinsong");
		string s2 = s1;
		string s3;
		s3 = s1;
		cout << s1 <<' ' << s2<< ' ' << s3 << endl;
	}
}

int main()
{
	cls::Test();



	return 0;
}